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Understanding and Delivering Bolus Doses
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The settings used to calculate a suggested bolus are:
•target BG
• insulin-to-carbohydrate (IC) ratio
• correction factor (CF)
• duration of insulin action
The inputs used to calculate a suggested bolus are:
• current BG
•carbs entered
A suggested bolus is equal to:
correction bolus + meal bolus – insulin on board
A suggested bolus can have a correction bolus only, a meal
bolus only, or both.
Correction bolus: The correction bolus, as the name suggests,
“corrects” for a blood glucose (BG) level above your target BG
level.
Meal bolus: The meal bolus provides insulin for the carbohy-
drates you enter into the System.
Insulin on board (IOB): IOB is the amount of insulin still working
in your body from a previous correction bolus. The amount of
time insulin remains “on board” or “active” depends on each
individual’s duration of insulin action. Insulin on board is sub-
tracted from the new suggested bolus until no active insulin
remains.
For formulas for each element of the suggested bolus calcula-
tion, detailed examples, and additional guidelines of how the
suggested bolus calculator works, see the Appendices.
■ Deliver a Normal Bolus
Deliver a bolus when suggested bolus calculator is On
1. After you check your blood glucose, the PDM displays the
results (Figure 4-1 on the next page). (See the end of Chapter
7, Checking Your Blood Glucose.) Press Next.
The OmniPod System can only subtract insulin on board
from a suggested bolus when the current BG is known.
A blood glucose value is current for up to 10 minutes
after it is tested. So you can wait up to 10 minutes,
restart the bolus process, and not have to retest your
blood glucose in order to include it in the suggested
bolus calculator.
When your blood glucose result reads “HIGH,” the
suggested bolus calculator will be disabled.
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